Japan BR5 at gun with 300mm penetration

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四一式山砲 (Type 41 Mountain gun ) 外装タ弾 (exterior loaded HEAT)
Type 41 Mountain gun that fires 200mm HEAT round with 300mm of penetration.

Ammunition Stat
Weight: 19.77 kg
Length 902.4mm
Diameter: 200mm
Penetration: 300mm
Explosive weight: 6.25kg
Velocity: 90m/s

300mm
Source: 研究事項ニ関スル綴〔内容明細裏面〕

PDF page: 141

Unfortunately I can’t find picture of it.
But I guess it has similar concept as Pak 36 with Stielgranate 41.
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Edit:
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80mm exterior loaded heat round with 100mm pen for Type 94 37 mm anti-tank gun.
It might give some insight on how the 200mm exterior loaded heat round might look like.

Picture source.

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Somehow I can’t edit the post.
I found a real picture of the Japan 37mm exterior loaded heat round.
You can use it as a reference to imagine how the 200mm version will look like.
37mm_atgun
Picture source: Rikugun: Volume 2 - Weapons of the Imperial Japanese Army & Navy Ground Forces

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